Investigation of the processes for determining the content of gold in products (on the example of the mining and processing plant "Nevsky" LLC "Druza")

Conducting a study of the activities of the assay and analytical laboratory to determine the gold content in gold-containing products. Atomic absorption, tetrometric and assay-gravimetric analysis methods for determining the gold content in products.

Рубрика Химия
Вид статья
Язык английский
Дата добавления 31.08.2020
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Natural Sciences Pedagogical Institute of Irkutsk state University

Investigation of the processes for determining the content of gold in products (on the example of the mining and processing plant "Nevsky" LLC "Druza")

Istomina Е.Е., Shataschkeev А.V.

The Gold (79Au) is found in the environment in its own form, because of this, it acts as the first metal mastered by man of the stone age. The Gold (79Au) is an element of the 11 group of the Periodic table of D. I. Mendeleev [1, p. 21].

The chemical properties of gold are presented by the authors N. N. Greenwood and A. Earnshaw in the work «chemistry of elements» [2, p. 501].

Druza, LLC -- one of the major gold mining companies, performing activity on the territory ofBodaibo district, Irkutsk region. In the last decade, there has been a clear trend towards putting into operation deposits with low concentrations of precious metals in the ore (1 gram per ton or less), the profitability of which is achieved only with large volumes of processing (millions of tons per year).

The required volume of technological testing and analysis of samples for gold extraction factories (GEF) - such deposits is extremely high and amounts to more than a hundred thousand samples per year. The volume of analyzed samples of operational Geosciences is no less high. As a result, the daily load on the analytical laboratory usually exceeds 500 samples [3, p. 10]. Taking into account the remoteness of gold mining enterprises and the seasonal nature of their supply, as well as the shortage of qualified personnel in the regions of Siberia and the Far East, the best solution is to automate analytical control processes.

Goals:

Reducing the number of accidents;

Improving the quality of measurements performed, reducing the number of defects;

Unifying and standardizing workplaces;

Increasing labor productivity by reducing the loss of time due to the organization of the workplace.

Methods

Method of analysis: NSAM # 505-X «Gold and silver».

Method of quantitative chemical analysis (QCA). Determination of gold and silver by assay method in rocks, ores and products of their processing”

Description of the composition of samples received for analysis: gold-silver ore. Measuring in-struments: scales MSE2. 7S-0CE-DM «Sartorius».

QCA method: assay-gravimetric. Reproduction of the QCA Protocol in whole or in part is prohibited without special permission from the laboratory.

The structure of the AAL of «Druza» LLC consists of four branches: 1) charging equipment; 2) melting; 3) razvedochnogo; 4) weight.

The main responsibilities of the AAL:

- performing all tasks and functions assigned to the AAL;

- implementation of regulatory legal acts of «Druza» LLC in the field of labor protection, industrial, fire, environmental safety and industrial sanitation,

- ensuring the reliability, objectivity and required accuracy of analytical results; assay gold laboratory tetrometric

- conducting tests and issuing protocols in the assigned area of accreditation;

- compliance with the requirements of regulatory documents regulating measurement procedures;

- performing measurements of the composition and properties of objects assigned by the accreditation certificate;

- internal quality control of analysis results;

- submission to the accreditation body of reports on the results of its activities, notification of the accreditation body of any changes in the status, structure, technical equipment;

Table 1 - The internal structure of the AAL GOK «Nevskiy» «Druza» LLC

Departments AAL

Actions research

Method

Composition

Crushing

Department

receiving samples from the OTC (control of the ZIF technology)

Charging

Department

Charge # 1 for poor ore; Charge #2 for rich ore. The charge is mixed with a sample of 50 g, AgNO3, covered with a tire (soda, borax), and then placed in a bag. Charging consists in mixing a sample of ore with special additives( charge): flux, lead glet (PBO) and reducing agents.

The bag is sent to the melting Department

SiO2, PbO, flour, baking soda, borax

Melting compartment

Crucible melting of cemented samples electric Furnace mine ti-gel operating temperature Range, 0C (950-1100). Melting the charge in the furnace for 40-50 minutes. it is combined with the crucible, beaten off; Merging the lead alloy into iron mills for cooling. Department lead (crude lead) from the slag. Kooperacija lead verbleef gold and silver to the king in the electric Furnace cooperacission, KP-1,2-24 (Cupellation of lead bullion (removal of lead))

Debarking Department

Gold-silvered kinglet (GSK) is beaten off, boiled (Processing the kinglet with dilute nitric acid (dissolving silver) dissolves Ag in HNO3), evaporated, the gold card remains (GC). Calcination of Golden squats

Atomic absorption method, tetrometric method, spectrum 5-4, assay-gravimetric method

Weight

Weighing a gold card

Filling in the working sheet of the mзк

Technical control Department (TOD)

Internal laboratory control

of 10% of samples once a month

Au (gold), Х*10-4, %

The standard of the ARRIMS

External laboratory control

Standard (reference) of gold

Au (gold), Х*10-4, %

- registration of works performed in the AAL;

- keeping records of all claims made based on measurement results;

- use of the resources provided by AAL in strict accordance with their purpose and according to the rules established in «Druza» LLC;

- participation in quality checks of analytical work through interlaboratory comparative tests.

«Druza» LLC has developed solutions to the most urgent problems on the GRF:

Complete assay and analytical laboratories (AAL) with measuring, preparatory and auxiliary equipment, including automatic assay analysis

automation of testing and analytical control on GRF;

automation of head testing of crushed ore.

the following standard solutions are offered for AAL with a large load (more than 100,000 samples per year).

if the concentration of gold in the samples is more than 1 g/t:

Automated sample preparation system

Automated assay melting system

Automatic milling machine

optical emission spark spectrometer ARL4460FA

SMS2500 Robotic sample management system for the arl4460fa optical emission spec-trometer

11.Scales for weight control of lead bullion

12.System bar-coding

at concentrations of gold in samples less than 1 g/t:

Automated sample preparation system

Automated assay melting system

nucomat automatic decomposition, sample preparation and analysis System

bar-coding System

for poor ores (Au < 1 g / t) and rich industrial products-a combination of the two above-mentioned configurations.

To automate testing and analytical control on GRF, the following solutions are offered:

Automatic selection and preparation of representative samples

transport of samples to the laboratory

the following solutions are offered for head testing of ore:

Automated sampling from the transporter

Automated testing on the embankment

testing according to GOST R 8.563-2009 [4], GOST 14180 [5], GOST 8.010-2013 [6] or ISO

Automatic generation of enlarged (replaceable, daily) samples

Return the reduced sample material to the conveyor

AAL management analyzes the gold content in gold-containing products and measurement activities in order to ensure their continuous effectiveness and improvement, making modern changes. In 2018, work was carried out on laboratory measurements for customers. When performing the work, the following indicators were evaluated: table 2.

Table 2 - The work performed AAL GOK “Nevskiy” “Druza” LLC

Laboratory measurements

Name of the indicator

Number of samples

Services of The Chief Geologist (SCG)

SCG samples

Au, *10-4 %

29875

Repeatability ILC

29875

N.11.2 NSAM-505-Х

3005

ILC accuracy (Standard sample)

739

Precision ILC

1297

Charge quality control

720

Repeatability of control samples ILC

5759

External control

245

Total samples:

35634

Quality control department (QCD)

Samples of ingot-gold-alloys (IGA)

Au, *10-4 %

312

Internal laboratory control (ILC) of reproduction

312

ILC accuracy (Standard sample)

40

Precision ILC

71

Total samples:

Samples of ingot-gold-alloys (IGA)

Au, *10-4 %

312

Repeatability ILC

312

ILK accuracy (Standard sample)

40

Precision ILC

71

Total samples:

ISI

Au, *10-4 %

21

External control

IC LMS JSC “Polyus”

Au, *10-4 %

240

Recommendations for improving performance in AAL:

Strengthen control over the implementation of quality Management procedures, management procedures, and QMS Instructions by AAL employees [11, p. 47].

2.To carry out repairs to the premises AAL.

Purchase new measuring instruments: pH meter; conductometer.

Purchase, in place of outdated, new auxiliary equipment: laboratory plate; rolls electro-mechanical.

Use the 5S system in work - a method of organizing the working space, the purpose of which is to create optimal conditions for performing operations, maintaining order, cleanliness, accuracy, saving time and energy.

References

1. Третьяков Ю.Д. Неорганическая химия. Химия элементов. Т.2 / Ю.Д. Третьяков, Л.И. Мартыненко, А.Н. Григорьев, А.Ю. Цивадзе. - 2-е изд., перераб. и доп. - М.: МГУ, 2007. - 670 с.

2. Химия элементов. Т.2 / Гринвуд Н.Н., Эрншо А/-М.: 2008, 666 с

3. Паспорт пробирно-аналитической лаборатории СМК-ПС-01-2018 // Н.В. Аксенова ГОК «Невский» ООО «Друза», Бодайбо, 2019 - 25 с.

4. ГОСТ Р 8.563-2009 «Государственная система обеспечения единства измерений. Методики выполнения измерений». М.: «Стандартинформ», 2009. 38 с.

5. ГОСТ 14180-80 Руды и концентраты цветных металлов. Методы отбора и подготовки проб для химического анализа и определения влаги. М.: «Стандартинформ», 2010. 19 с.

6. ГОСТ 8.010-2013 Государственная система обеспечения единства измерений (ГСИ). Методики выполнения измерений. Основные положения. М.: «Стандартинформ», 2019. 36 с.

7. СК-РЖ-7.11-2017 Журнал регистрации результатов испытаний технологических проб ЗИФ // Н.В. Аксенова ГОК «Невский» «Друза», Бодайбо, 2017 - 5 с.

8. СК-РЖ-7.13-2017 Журнал регистрация выданных протоколов результатов испытаний проб карьера, МСИ, внешних заказчиков. // Н.В. Аксенова ГОК «Невский» ООО «Друза», Бодайбо, 2017 - 5 с.

9. СК-РЖ-7.14-2017 Журнал учета расхода реагентов, материалов // Н.В. Аксенова ГОК «Невский» ООО «Друза», Бодайбо, 2017 - 5 с.

10. Истомина Е.Е. Об управлении качеством при проектировании и разработке изделия из пенополиуретана // Компетентность /- 2019 - №5. - C. 46-48.

Abstract

The article deals with the processes of determining the gold content in the products of the «Nevsky» mining and processing plant of«Druza» LLC. The activity of the assay and analytical laboratory to determine the content of gold in gold-containing products was investigated. The composition and structure of AAL GOK «Nevsky» LLC «Druza» is considered. The paper describes methods for determination of gold content in the products: atomic absorption method, titrimetrically method and Assay-gravimetric method. The principles of internal and external laboratory control in the AAL of a gold mining company are defined.

Keywords: gold recovery factory (GRF), assay and analytical laboratory (AAL), gold bar, sample, gold-containing ore, methods for determination of gold by atomic absorption titrimetrically assay and gravimetric.

В статье рассмотрены процессы определения содержания золота в продуктах горно-обогатительного комбината «Невский» ООО «Друза». Проведено исследование деятельности пробирно-аналитической лаборатории по определению содержанию золота в золотосодержащих продуктах. Рассмотрены состав и структура ПАЛ ГОК «Невский» ООО «Друза». В работе описаны методы определения содержания золота в продуктах: атомно-абсорбционный метод, тетрометрический метод и пробирно-гравиметрический метод. Определены принципы внутреннего и внешнего лабораторного контроля в ПАЛ золотодобывающей компании.

Ключевые слова: золотоизвлекательная фабрика (ЗИФ), пробирно-аналитическая лаборатория (ПАЛ), слиток золота, проба, золотосодержащая руда, методы определения содержания золота: атомно-абсорбционный тетрометрический и пробирно-гравиметрический.

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